Having said that, there are also photographic gadgets that do not serve any purpose. Or, to put it this way, they are not even worth their low price. Let's take a look at some of those.
Note: I do include links to Amazon for the convenience of comparison and photos. Personally, I would not use any of the products listed below. But if you think you might have use for them, all the power to you.
Whoever thought of this should be forced to wear it as a hat every day for 6 hours - 8 on weekends. Let's see... Take a low-quality plastic that is a couple of times larger than your camera (try to visualize this folks), and off you go, to explore the magnificent world of the deep. Or, better, leave the camera at the hotel, and enjoy a nice day at the beach instead. Unless of course if you want to look like a disabled person with a ventilator hanging on your chest, and you love blurry pictures that look as if they were taken behind a plastic... oh, wait.